دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a well previously drilled in an area of drilling interest, the data from which may be a reliable source of information in the planning of a new well.

n: Usually using high quality adjacent well as the control well to lead other drilling scheme with its geologic information and data in optimized drilling technology.

n: the mud that control well blowout or overflow.

n: the mud density that control well blowout or overflow.

n: in pipeline construction. the hole drilled as the first step of a directionally drilled river crossing. It establishes a pathway for the pipeline.

n: a small-diameter hole that is later opened up to the required diameter. Sometimes used in directional drilling to control wellbore deviation during kick-off.

a small (sometimes) diameter hole drilled through a pay zone to determine the pay top and bottom or various contacts, before the main well position is selected. May also use a pilot hole to better control influx rate.